Mining apparatus



C. F. OSGOOD MINING APPARATUS July 9, 1935.

Filed Sept. l2, 1932 6 Sheets-Sheet l fnUenZ/or: ZeJ'FOaggood.

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July 9,1935. C. F. OSGOOD 2,007,000

MINING APPARATUS Filed Sept. 12, 1952 6 Sheets-Sheet 3 jini/venan July9, 1935. Q F. OSGOOD 2,007,908

MINING APPARATUS Filed Sept. 12, 1952 `6 Sheets-Sheet 4 110 Fig. 7

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MINING APPARATUS Filed Sept. l2, 1932 6 Sheets-Sheet 6 fig@ gl M ya@lgglg,

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2,007,908- MINING APPARATUS UNITED-STATES i PATENT OFFICE N Charles F.Osgood, Claremont, H., assignor to Sullivanlvachinery Company, acorporation of Massachusetts"` A Application september 12, 1932, serialNo. 632,726

` cs claims. (ci. 26e- 2st l This invention relates to mining apparatus,Fig. 13fisa detail sectionalview taken substanand more particularly toimprovements in coal tially on line |3 |3 of Fig. 12. mining apparatusof the combined horizontal Fig-1li isa transverse vertical sectionalview and shear cutter, wheel'mounted, track supported takensubstantially on line M M of Fig. 1'. l 5 and guided type. .g Y sFig."15 is a detailview illustrating a'rportion 5 An object of thisinventionis to provide an of the `mechanism shown in Fig. 14.

. improved coal mining apparatus. Another ob` Fig-i6A is a transversevertical sectional view ject is to provide anv improved" coal `miningaptaken substantially on line iB IB of Fig. 4. paratus ofthe combinedhorizontal, shear.- cut- Fig. 17 is a diagrammatic plan Yview showing`ter type having improved adjustable kerficut-f the mining apparatusmaking a horizontal cut l0 ting mechanism. Afurther object is to provideat the level of thefmine floor inaccordance with an improvedadjustablekerf cutting mechanism thearcwall method.

for suchan apparatus whereby kerfs may be Fig. 18 is a diagrammatic planView showing cut in the coal facerat any desired location bevthe miningapparatus making a shearingV cut tween the mine roof and mine floor.-and beat the rib. 1

tween the ribs of the entry. Another object Fig. 191s a diagrammaticplan View of the minis to provide` an improved adjustable support- Mingapparatus makinga shearing cut between ing structure forthe kerf cutterof a coal minthe center of the entry and the4 rib. `ing apparatus.. Afurther `object isV toprovidev Fig. 2G is -a diagrammatic plan viewshow- 20 in an apparatus` of the above characteran im` in'g the miningapparatus making a shearing cut 20 proved adjustable kerf cuttingmechanism whereat the `center of the entry. by a horizontal kerf lmay becut atthe level `of Fig. 21 is a diagrammatic plan view showing the minefloor outside and below thelevel ofY the,miningapparatusmaking aslabbing cut. the mine` trackway. .These and other objects; Fig. 22 is adiagrammatic lelevational'view 25 will,howevenhereinafter more fullyappear.` K`showing the mining apparatus making a shear- 25 In theaccompanying drawings there is shown, ing eut. t Y

- for purposes of illustration, `one*formjwhiclifthe f In thisillustrative embodiment of the inveninvention may assume in practice.-

. tion'there is shown a coal mining apparatus of In these drawings, .t i

the combined horizontal and shear cutter, wheel Fig. l is a plan view ofthe illustrativeembodimounted, track supported and guided type, gen.-

ment of the improved mining apparatus. erallycomprising a self-propelledportable base I, Y Fig. 2 is a side elevational View of themining ahorizontal turntable 2 mounted on the base for `apparatus shown inFig. 1. adjustmentinto diiierent elevated positions rela- Fig. 3 is ahorizontal sectional View taken tive to the base and for universaltilting movesubstantiallyon line 3 3 of Figs. 2, and 4. C mentrelativetothe base, and improved adjust- 35 Fig. 4 is. a central, longitudinallyextending, able supportingstructure, generally designated 3, verticalsectional View takensubstantially on line *iorl supporting A akerfcutting mechanism 4. 4 4 of Fig. 1. l Mounted on theturntable is abox-like armstruc- Fig. 5 is a detail verticalsectional view taken tureor Vextension frame 54 overhanging the for- 40 substantially-on lineVr 55 of Fig. 3. ward edge of the turntable supportingirame and 40 Fig. 6 isa horizontal sectional View taken on the base and havinglrotatablymounted thereon `line 0 6 of Fig. 4. l. 1 at its forward extremity anunderslung head 6 Fig. 7 is a horizontal sectional View taken subfldisposed on aV horizontal axis located below Vthe stantially on line 'Il of Fig. 2. .Y top of the turntable and in turn having pivotally Fig. 8ris `a vertical sectional `view taken on mounted thereon a swingable armstructure 1. 45 line 8 8 of Figs. 1 and 7. Pivotally mounted on theouter extremity of the Fig. 9 is a transverse sectional view taken sub-Y arm structure 'l is a swingable kerf cutter supstantially online 0 9of Fig. 8. porti?. Suitable motor operateddevices are prof Fig.V 10 is adetail sectional view taken on videdY for elevating anduniversally.tilting the line i0 |0.of Fig.` 9. v "Y Fig.` 11 is a verticalsectional View` taken" sub#l adjustable supporting structure 3, foroperating `stantially on line H ll of Figs. 1 and 12. the cuttingmechanism 4, and for driving the Fig. 12 is a plan view of themechanismlshown truck wheels for propelling the basa-as will herein Fig.11,J parts being shown in horizontal secinafter be'described. tion toillustratefstructural details. f The base Iis herein intheformof-*a'wheeled 55 turntable, for rotatingthe head, forj operatingthe 'o0 truck of a well known type comprising a frame 9 supported o-ntruck wheels I@ adapted to run along a mine trackway il. Supported onthe truck frame at the rear of the turntable 2 is a motor I2, hereinpreferably of the reversible electric type, connected through a pluralspeed transmission mechanism, generally designated I3, t the truckwheels and through connections to be hereinafter described to thedevices for elevating and tilting the turntable 2. Mounted at the rearend of the truck is a usual reeling device i4 for the power conductorcable I5 through which current is supplied to the motor i2 and a maindriV- ing motor l5 mounted on the rotatable turntable structure. Alsomounted on the truck frame is an electrical control apparatus il for themotors l2 and It.

Referring to the turntable mounting structure for the cutting mechanism,it will be noted that supported for vertical and universal tiltingadjustments relative to the truck frame is a supporting frame l2, hereinin the form of an annulus or ring having attached thereto a pluralityof, herein three, depending brackets I9, the lower ends of which areshaped to engage, respectively, with upstanding guide members 20, hereinin the form of screw pedestals, which are secured to the truck frame.Fixed to these depending brackets i9 are internally threaded nuts 2i(see Fig. 5) which are Vthreadedly engagedwith vertical screws 22rotatably supported atvtheir upper ends-by the up- Vstanding guidemembers 2! and at their lower endsrin step bearings 23 formed in bearingbrackets 24 attached to the bottom of the truck, frame. It will be notedthat the nuts 2l are so connected tofthe feet of the depending bracketsas to permit a slight relative rocking movement between the parts., Thethree sets of screws and guide membersconstitute'upright supports forthe annularV supporting frame or ring I8, and the latter can be adjustedvertically in parallelism or angularlyto change its angle in altitude bysuitable rotation of the screws. Mechanism for separately orsimultaneously rotating the screws will be later described. Theturntable 2 supported by the annular frame I8 is in the form of acircular casting which constitutes the main frame of the cuttingmechanism. This casting forms the turntable rotatable about the centerof the ring i8 and is guidedfor rotative movement in the ring by adepending annular ange 25 fitting the interior periphery of the ring I8and by a radial ange 23 overlying the top surface of the ring.

Motor operatedl devices are employed for rotatingthe turntable 2, andherein comprise the motor IG, which is herein preferably of thereversible electric type suspended beneath the turntable casting withinthe lateral limits of the annular supporting frame I8 in the mannershown. The power shaft 2l of this motor is horizontally disposed andextends transversely across the turntable beneath the top surface of thelatter, and. has fixed thereto a` bevel pinion 2d meshing with a bevelgear 29 xed to a vertical shaft 38 suitably journaled within theturntable casting. Fixed to and driven by the shaft 30 is a spur gear 3|meshing with a spur gear 32vsuitably fixed to a vertical shaft 33,herein arranged parallel with the shaft 30 and likewise suitablyjournaled within the turntable casting. Secured to the shaft 33 is aworm 34 meshing with a slow speed worm wheel 35v connectibie, by amultiple disc clutch 36 of `a usual design, to a horizontal shaft 3l.Fixed to and driven by the shaft 31 is a worm 38 meshingpasshownin Fig.3,v with a WormY wheel 39 rotating about a Vertical axis and suitablyjournaled within the turntable casting. As shown in Fig. 4, this wormwheel drives a vertical shaft 48 connectible, by a clutch 4I, to a spurgear 42 supported by the shaft and meshing with the teeth of a circularrack 43 formed on the inner periphery of the annular supporting frameI8; the

Vgear 42 when released from the shaft 43 being freely rotatable on theshaft. Also meshing with the spur gear 3i is a spur gear 44 secured to avertical shaft 45 arranged parallel with the shafts 33, 33 and disposedat the opposite side of the shaft 30 from the shaft 33, as shown in Fig.3. Driven by and rotatable with the shaft 45 is a worm 46 meshing with afast speed worm wheel 41. This worm wheel is connectible by a multipledisc clutch 48 similar to the clutch 36 to the shaft 3T. It will thus beseen that when the clutch 4l is connected and one or the other of thedisc clutches 33, 4S is applied, the turntable 2 may lbe rotatedrelative to' the annular supporting frame i8 to swing the cuttingmechanism about the `turntable axis at either. a relatively highpositioning speed ora relatively low cutting speed. The teeth of theworm gears 38, 39 are self-locking and lock automatically the turntableagainst rotation when the clutches 36, 48. are released. Theturntable'rel'ease clutch 4 i, that is the clutch for, freeing theturntable from the self-locking worm gearing, comprises, as shown inFigs. 4

and, clutch plungers 49. guided within slots Eil formed in the shaft 4D.Rotatably mounted with- .in theY shaft 4G isa clutch operating shaft 5lhaving an operating handle 52 and formed on its i When the shaft lowerendapairof grooves 53. 5I is in the position shown in Fig. 4, the clutchplungers are projected within notches 54 formed in' the gear 42, therebylocking the gear to the shaft 4e. When the shaft 5I. is turned to bringnotches 58 in registry" with the grooves 5D the clutch plungers are freeto slide inwardly thereby to release the gear 42 from the shaft 4Q. Theclutch 4|, whenA released, cuts loose, so to speak, the turntable fromits rotating mechanism, thereby permitting the turntable to rotatefreely relative to the annular supporting frame i3.

'.Nowf referring to the kerf cutting mechanism 4, and more particularlyto the improved adjustable supporting structure therefor it will beobserved that' formed integral with the box-like extension frame or armstructure 5 overhanging the annular frame |8,. and depending from thearm structure is a circular frame arranged in a substantially vverticalposition and rigidly braced with respect to the arm by means of verticalwebs 56.'Y As illustrated, secured to the circular frame 55' is ankannular retaining and bearing sleeve 51 having an inwardly directediiange 5u. Between this flange and shoulder 53 formed on the circularframeA 55 there is rotatably mounted a sleeve E-l which herein. forms arotatable support or neck for the rotatable head 6. This bearingsleeve'li is secured to a projecting neck frame 6| on which theadjustable supporting structure 3 for the cutting mechanism 4 ismounted, as will later be described.

Y 'Themechanism for effecting rotation of the cutter head frame. 6iabout the axis of the neck herein comprises a bevel gear d2 fixed to theupper end of the shaft 3E! and meshing with a bevel gear 63 keyedto ahorizontal shaft @4. The shaft 64 extends radially with respect to theturntable axis. and is suitably journaled within the turntable castingand circular frame 55. Fixed to the, shaft 54 is a spur gear 65 meshing`with a spur gear 66 keyed to 'a parallel shaft E' likewise suitablyjournaled within the turntable casting. V.Also fixed to the shaft t? isa bevel pinu ion iidmeshing with reverse bevels 69 and 'itl (see Fig.l5) These 'reverse bevels are selectively con- `nectible by frictionclutches 'H andl respecwise suitably journaled within the turntablecasting. Fixed to the forward end of the shaft i9 (see Fig. 3) is aspur` gear 8i) meshing with an internal gear Si herein formed integralwith the rotatable support El) secured to` the cutter head frame t i. Itwill thus be seen that upon suitable application of thel frictionclutches V"il, l2 the cutter head frame t! may be rotated about `theneck axis in one direction or the other to posi tion the cuttingmechanism in a plurality of intersecting planes about the neck axis. Theworin gearing ll, '18 is of the self-locking type and when the clutchesare released, automatically locks the cutter head frame against rotationabout the axis of the neck, thereby maintaining the cutting mechanisminany of its adjusted positions about the neck axis. `Now referring to theimproved adjustable supporting structure 3 for the cutting mechanism, it

`willbe observedthat formed on `the rotatable neckframe'ii and extendingforwardly there- :from are projections 55, 85 which are parallel to`each other and parallel to and equidistant from the axial line of theneck. `ln each of said projections is a bearing titi in alinement withthe other of said bearings on a line` which is peri-V pendicular to andintersects the axial line of the' extends through the projections t9 and85 within the bearings to forrnjournals for the arm 88, said `journalsbeing on an axial line which is perpendicular` to and `intersects theaxial line of the neck. `At its forward `end the arm 83 has a pair i fparallel projections Sil, Sli each of which is in `approximately theplane of the corresponding projections BSB, and each of theseprojections overlaps the inner face of one of a pair of projections Ql,9i formed on a support el. on which the `kerf cutter is mounted.Supported withineach `of vthe projections SU, Slt is a bearing sleeveet,

and mounted within` these bearing sleeves is a transverse hinge shaft 94arranged parallel to the shaft 8l. rIhese bearing sleeves in which 'theshaft M is supported project outwardly through' the side arms 9|, 9iformed on thercutter sup port $2 and form a pivotal mounting for thecutter support 92 as hereinafter described. Pivot ally mounted on thecutter support 92 about an axis perpendicular to the axial line` of theneck, in the manner hereinafter described, is an elongated plane cutterbar glcarrying on its margin fixed to a transverse shaft 25. `suitablyjournaled in bearing sleeves 25 supan endless cutter bitcarrying cutterchain 96, this cutter bar being swingable about its axis in planesparallel to the neck axis andin planes including the neck'axis. Y

The driving connections between `the motor i6 and the cutter chain therein include the'bevel `gearing 2S, 29, vertical shaft 3i?, bevel'gearing 62, 53 and the horizontal shaft 54. Keyed to the forward end..of the shaft 6d is a spur gear I) meshing with a spur gear Ili keyed toa shaft lili herein extending along the axis of theV neck and suitablyjournaled within the frames and 6 I. Fixed to the forward end of theneck shaft It is a bevel gear HB3 meshing with and driving a bevelgearil loosely mounted on the hinge shaft 3l. On the arm 38` are twobearings it, m5 which are on an axial line which. intersects the axiallines ofv the hinge Vshafts 3l' and ed, and the axial lline of the neck.In said bearings is journaled a transmission shaft llo" which has xedthereto at its rear end a bevel gear i3? meshing with anddiiven by thebevel gear IM, as shown in Fig. 7. Fixed to the forward end of the shaftilltis a bevel gear lull meshing with and driving a bevel gear its fixedtothe hinge shaft im. Journaled within the cutter support Q2, as sho-wnin Figs. 7 and 8, is a shaft Vi i@ having fixed thereto at its rear enda bevel gear l il meshing with and driven by the bevel Fixed to theforward end of the shaft llt, as shown in Fig. 11'," is a bevel gear` H2meshing with a bevel gear H3 keyed to a shaft` iid suitably journaledwithin `the cutter support e2 and arranged with its axis perpendicularto the shaft llEl andthe axial line of the neck.

Keyed to the shaft l ld is a chain `sprocket `I l5 which engages anddrives the cutter ch'ain 96 in the manner well understood in the art.,The cutter ,support 92 comprises abody H6 and a cap member lil which issuitably secured to the body. The pair of projections Si, 9! is formedon the body HE. vThe body extends forwardly and has a bearing l H3Vwhich receives one end of the shaft llhas shown in Fig. ll.. The capmember extends forwardly and has a bearing H9 in alinef ment with thebearing iii? and also receives the shaft IM. `Swivelly mounted on thebearings H3, H9 to swing about the axis of the shaft lift is a barhanger frame or support i2@ which car- It will thus be seen that riesthe cutter bar 95. the cutter bar Sie is pivoted to swing on the axialline of the shaft `i lli. i

The mechanism for swinging the cutter'bar herein comprises a worm wheell2! loosely surrounding the bearing HESV and journaled on thecylindrical bearing engaging portion G22 of the hanger `support 26, asshown inFig. 1l. This worm wheel rests against a supporting plate 23`and bears against the horizontal bar support, and

is adapted to be engaged with the cutter support by a latch mechanism tobe hereinafter described. It will thus be seen that the worin wheel iliis arranged concentric'with `the, shaft Mii, and

meshing with this worm wheel is a worin ift The shaft i125 is portedwithin boss-like projections |21, l2? formed integral with the side armsQi, 9i. The

mechanism for rotating the worm in either of opposite directions toswing thecutter bar in is suitably journaled within a gear housing |32secured to the side of the cutter support @2. Splined to the shaft |3|is a jaw clutch member |33 which is operable to connect selectively .thereverse bevels to the shaft |5l. Keyed to the shaft 'e is a worm |315(see Fig. 13) meshing with a worm wheel |35 keyed to the shaft |25 whichdrives the worm |24 meshing with the bar swinging worm wheel itl. Itwill thus be seen that the cutter bar may be swung in its plane aboutits pivot and that the cutter chain may be driven irrespective of theadjustment of the sup porting structure about the neck or the plane ofoperation of the cutter bar.

The latch mechanism for locking the hanger support lZil to the wormwheel iill or for releasing the hanger support for free swingingmovement about the axis of the shaft i M herein comprises a latch |35pivotally mounted at |31 on the hanger support it. The cap plate l isprovided with a notch |36 for receiving the latch and allows said latchto rest between two teeth of the worm wheel |2l. Suitable means |39 isprovided for maintaining the latch it in its locking position, thismeans its being readily releasable to permit swinging of the latch intoits unlocked position. It will thus be seen that when the latch is inits locking position, as shown in Fig. 1i, and the worm wheel |22! isrotated through the mechanism above described, the cutter bar may swungwith the worm wheel at a slow cutting speed. When the latch |36 is swungdownwardly and released from the teeth of the worm wheel and the notch38 in the cap plate, the cutter bar may be freely swung relative to theworm wheel. This latch mechanism may be the same as that described inthe patent to Oldroyd l,46,076.

The mechanism for adjusting the improved supporting structure 3 toposition the cutter bar in parallel planes while maintaining the cutterbar parallel to a line parallel to the neck axis or for tilting thecutter bar out of parallel relation with the neck axis comprises Wormracks |40 formed on the projections 85, 85 of the revoluble headstructure. Meshing with these worm racks are parallel worms i4 |fi|keyed to parallel shafts |42, |42 suitably journaled within the arm 88,and in the present construction arranged with their axes perpendicularto the axial line of the hinge shaft 5l. Keyed to the shafts M2, E42 areworm wheels M3, |43 (see Fig. 9) which mesh with worms |44, Mii keyed toa transverse shaft |135 likewise suitably journaled within the arm 8S.Keyed to the shaft |45 intermediate its ends is a worm wheel M6 meshingwith a worm |61 loosely mounted on the transmission shaft me. This wormis connectible to the shaft les by a suitable clutch i128 havingsuitable shipper mechanism |69 including a transverse shaft |59 carryingat its opposite ends operating handles |5| located at the opposite sidesof the arm 88. Also formed on the projection 9|, 9| on the cuttersupport S2 are worm racks |52, |52 with which mesh worms |53, |53 keyedto parallel shafts |54, |54 suitably journaled within the forward end ofthe arm 8d. Keyed to these shafts are worm wheels It, |55 with whichmesh worms |56, |56 keyed to a transverse shaft |51 herein arrangedparallel with the shaft |45 and likewise suitably journaled within thearm 88. Fixed to this shaft intermediate its ends is a worm wheel |58with which meshes a worm E59 (see also Fig. S) loosely journaled on thetransverse shaft |05 and connecti le to the shaft by a clutch |60similar to the clutch |48 and having similar operating mechanisinincluding handles |6| arranged adjacent Ythe handles |5| heretoforedescribed. From the foregoing description it will be evident that whenthe worms it?, iBS are connected to the shaft G8 and the shaft it isconnected to the motor, the worms MI, |4| meshing with the worm racksMil and the worms |53 meshing with the worm racks |52 are simultaneouslydriven, causing the arm 8S to be swung about the axis of the hinge shaft3l in one direction while the cutter support 92 is swung about the axisof the hinge shaft et in the opposite direction, the speeds ofadjustment being so proportioned that as the supporting arm and cuttersupport are swung simultaneously about their respective axes the cutterbar 95 is maintained at all times parallel to a line parallel to theaxial line of the neck. It will be evident that when the clutch ifs@ isdisconnected and the clutch connected the cut ter support S2 may beswung about the axis of the hinge shaft 91% while the arm 53 remainsstationary, thereby enabling the cutter bar to be tilted out ofparallelism with the neck axis about an axis transverse to its length.It will also be evident that when clutch |58 is connected and the clutchlllt released the supporting arm may be swung about its axis while thecutter ort remains stationary as to movement ab meshing with the wormracks on the revoluble head frame and cutter support respectively areself-locking and maintain automatically the arm and cutter support intheir different positions of adjustment about the axes of the hingeshafts.

Now referring to the mechanism for driving the truck wheels, it will benoted that fixed to the power shaft of the motor :2 is a worm 65 (seeFig. le) meshing with a worm wheel |56 rotatably mounted on a transverseshaft it? suitably journaled within a frame |653 suitably secured to thetruck frame. This worm wheel may be operatively connected to the shaft|57 by means of a friction clutch |69 having suitable operatingmechanism including a hand lever |70. -Fixed to this transverse shaft|51 is a brakJ drum il'l which is engaged by a brake band |12 alsoarranged to be controlled by the hand lever |78. When this hand lever isswung in one direction the clutch is applied and in the oppositedirection the brake is applied and the clutch released. Journaled onthis shaft Il'l is a spur gear H3 connectible with the shaft by a jawclutch member |14, splined to the shaft,l and this gear meshes with aspur gear l'i. The spur gear iii is connected to a transverse shaft isuitably journaled within the frame |33. Keyed to the shaft |62 is aspur pinion l'i'l meshing with a spur gear H3 secured to a transverseshaft H9 (sce Fig. l5) arranged parallel with the shaft |67. Splined tothe shaft i'it is a slidablc pinion |88 adapted to mesh with a spur gearli keyed to a sleeve 82 herein formed integral with the spur gear H73.If desired, operating mechanism may be provided for the clutch member|75. and the sliding pinion it@ so that when one is connected the otheris released. As illustrated, secured to the shaft l'il is a chainsprocket |83 connected by an endless chain connection |36 to a chainsprocket secured to the rear truck axle. front and rear truck axles areconnected together by a usual chain and sprocket connection |35. It willthus be seen that when the jaw clutch l'ill is shifted to connect thespur gear |13 to the shaft |61 and the pinion |25 is out its axis. Theworms Mii, lll and |53, |53

The

l 2,607,908 of mesh-withthespur gear ll, the ltruck wheels ment with thespur gear tdi, the truck wheels may beldriven at a relatively slowspeedappropriate for cutting through the reduction gearing lll, llt,ltand IBI. Upon reversal of the motor i2. the truck wheels may be drivento propel the apparatus in the reverse direction at either a relativelyhigh or a relatively loW speed.

` The mechanism for driving the Aturntable elevatingand tilting screws22 herein comprises a bevel pinion i8@ (see Fig.` le) journaled on theshaft it? and connectible to the shaft bythe clutch member lliil Thisbevel pinion meshes with a bevel gear ll fixed to a verticalshaft `itilsuitably journaled within the frame 558. Keyed to the shaft H83 is aVchain sprocket l39 which engages and drives an endless transmissionchain lie arranged beneath the truck frame.

Idler sprocketslld! and L92 serve to guide the chain mit relative tochain sprockets l93 rotat` ably mountedas shown in Fig. 5, upon each ofthe screws 22 at its lower end, and these sprockets are driven by theendless chain ltd. As shown, the sprockets 93' have formed thereonclutch teeth ld adapted to engage with similar teeth on clutch membersH95 splined to the lower end of the screws. The screwsextend'downwardlythrough openings in the top plate of the truck frame and theclutchinembers 95 are each provided with a groove li in engagement withan armr l9l attached to a vertical operatingshaftV Hi8. The shafts i951extendthrough the top plate' of the truck frame and are eachprovidedwith a handle i9@ by which the movement of the clutch membersmay be controlled. lIt will thus be seen that when all the clutches'` lare in a position to connect the chain sprockets vi933 to the screws,the latter may be `simultaneously rotated tomove the turntable2*together with the cutting mechanism supported thereby, into differentelevated positions relative to the truck frame. It will also` be notedthat byreleasing certain of these clutches and connecting certainIothers the screws may be rotated to effect tilting movement of theturntable `about a horizontal axis to change its angle in altituderelativeto the truck frame.

The mode of operation of the improved mining apparatus `is as follows:The-apparatus is propelled along the mine trackway at a relatively hightransport speed through the truck wheel driving gearing it, li, H3, H5driven by the motor i2, it being understood at that time theadjustablesupporting structure 3 and the cutting mechanisme are swungupwardly from the full line position shown in Fig..2 to a positionwherein `the cutter bar is` disposed above the level of the 'trackwayfWhenthe working face is' reached,

the high speed `truck'wheel drive is disconnected from the motor l2 byreleasing the friction clutch it and the-slidingclutch VM. `If it isdesired i to make a swinging cut atror near the level of the niineiloorin front of the end of the tracki way, the controlling clutches lil-3and lufor the adjustable supporting structures are connected,

and upon running of the motor I6 in Vthe' proper,

direction, the supporting arm 88 'is swung downwai-ulyabout the axisofmening@ shaft a1 while 5 the cutter support 92 is simultaneously swungupwardly aboutthe axisof thehinge shaft 94 until the parts assume theposition indicated in full lines in Fig. 2, the clutches itil,i-thereafter being released. With thecutter bar thus disposed theoperator connects the proper reverseV bevel 1129, tofthe bar swingingmechanism to the shaft l 3i andthe cutter bar is swung in its planethrough the bar swinging gearing 6M, H35, |24, l

l2! under the control of the clutch H33, the cutter bar swinginglaterally about its pivot relative to is: swung transversely in itsplane from right to leftacross .the .front end of the trackway at arelatively low cutting speedto make a swinging cut beneath the coal.,When the tip end ofthe bar reaches a position adjacent the left hand ribthe bar swinging clutch 133 is released, Vand upon release of the Vbrakelll, H2 the apparatus is propelled rearwardlyV along the mine trackwayat a` low speed throughA the Y itt, it, Il?, lie, 185i', ll and H3, H5driven by the motor i2 to move the `cutter bar away from the coal face.The cutter bar is thereafter swung into its central position shown `inFig. l, and upon connection of the clutches Hi8, Hill and reversal ofthemotor/le, the adjustable supporting structures is swung upwardly to movethe cutter bar into its transport position above therle'vel of thetrackway. The apparatus is then propelled rearwardly along the minetrackway under the `propulsion ofthe high speed truck driving gearing-E65, N36, H3, H5 driven by the motor l2.

If it is desired to Acut a horizontal kerf at or near the level of themine bottom outside andbelow the level of the mine trackway inaccordance with the arcwall method, the operator applies,v

the friction clutch iiof thefast-speed turntable rotating mechanism,thereby rotating theJ turn-v table 2, together with the cuttingmechanism supportedthereby, fromthe central position shown in Fig. i tothe full line position indicated at `A in to the cutter support 9E underthe controlof the.

clutch 633 of the bar swinging mechanism until the tip end of the cutterbar assumes the full line"A position shown in Fig. i7 adjacent the righthand rib at a less angle than the angleV of the arm 68 relative to therib. When the posed with the bar pivot" lying outside the mine parts arethus dis.- i

bar is disposed adjacent the truck driving gearing Y trackway, thecontrolling*` clutches M3,- liiil for the;V

adjustable supporting structure Aare, connected therebyV movingv A.thecutter bar .at-,or near the j level' of the'mine oor as shown in fulllines in Fig. 2, the clutches i133, ,itu thereafter being re. leased.Atpthat time, the cutting mechanism is connected in driving relation`with the motor and the cutter chain isv rapidly circulated about themargin'of the cutter bar S5. The pinion |80 of 6 the slow` speed truckdriving mechanism is then slid into meshing engagement with the gear |8|and upon application of the friction clutch |69 the truck wheels aredriven to propel the apparatus bodily in the forward direction along theinine trackway at a relatively slow cutting speed, sumping the cutterbar 95 beneath the coal until it assiunes the dotted line positionindicated at B in Fig. 17. The friction clutch |69 is then released andthe brake ITI, |12 set. The operator then applies the friction clutch 3Sof the slow speed. turntable rotating mechanism and the turntable 2,together with the cutting mechanism supported thereby is rotated at aslow cutting speed to effect horizontal swinging movement of the cutterbar in its plane across the coal face to make a horizontal cutthereunder. During the initial rotative movement of the turntable 2 thecutter bar 95 is swung about its pivot under the control of the clutch|33 in the reverse direction until the parts assume a straight lineposition indicated at C in Fig. 17 wherein the cutter bar extendsradially with respect to the turntable axis. When the cutter bar assumesthe dotted line position indicated at D in Fig. 17 with its tip endadjacent the left hand rib and the swinging cut beneath the coal hasbeen completed, the cutter bar is again swung about its pivot in adirection opposite from the direction of turntable rotation under thecontrol of the clutch |33 while rotation of the turntable is continued,the turntable and cutter bar swinging simultaneously in oppositedirections at that time until they assume an angular position with thecutter bar disposed at a less angle relative to the left hand rib thanthe angle of the arm 88 relative thereto, as indicated in dotted linesat E in Fig. 17. The clutches 3S and |33 and the brake |12 are thenreleased, and upon application of the friction clutch |69 of the truckwheel drive and the reversal of the motor I2 the apparatus is propelledbodily rearwardly along the mine trackway at a low cutting speed, movingthe cutter bar from the dotted line position indicated at E in Fig, 17`to the dotted line position indicated at F in that figure, withdrawingthe cutter bar from beneath the coal. After the completion of the cutbeneath the coal the parts are again returned to their central transportposition with the cutter bar disposed in an elevated position above themine trackway.

A horizontal kerf may be cut at or near the level of the mine roof;`simply by applying one or the other of the friction clutches 1|, 12 ofthe head rotating mechanism to effect rotation of the head frame 6|about the neck axis, thereby moving the cutter bar through an arc of acircle from the full line position shown in Fig. 2 to its oppositehorizontal position above'the head axis, as indicated in dotted lines inFig. 2. To vary the elevation of the cutter bar when thus disposed,

the adjusting mechanism for the supporting structure 3 Ymay be connectedin driving relation with the motor I6 thereby to effect swinging of thecutter bar upwardly or downwardly to the elevation desired. When thecutter bar is thus positioned it is sumped in, swung transversely in itsplane and withdrawn from the coal in accordance with the usual arcwallmethod of cutting. By adjusting the supporting structure 3 the cutterbar may be disposed to cut kerfs in any desired horizontal planesbetween the mine roof and the mine floor.

To eiect a slabbing cut, the turntable 2 is rotated to move theadjustable supporting structure 3 laterally until the cutter bar assumesthe cutter bar into the desired horizontal position.

When the cutter bar is disposed in the position shown in Fig. 2l theslow speed truck drive is connected in driving relation with the truckwheels and the apparatus is propelled rearwardly along the mine trackwayto eiiect a slabbing cut in the coal.

It will be noted that during any of the horizontal cutting operationsdescribed above, for instance when it is desired to cut on a rolling oruneven bottom, or a pitching coal seam, the cutter bar may be tilted tochange its angle in altitude simply by rolling the cutter head about itsaxis relative to the turntable structure and by swinging the cuttersupport 92 upwardly and downwardly in the desired direction about theaxis of the hinge shaft 94. The cutting mechanism may also beuniversally tilted relative to the truck to change its angle in altitudesimply by disconnecting certain of the elevating screws 22 from themotor i2 while others are rotated, thereby causing the turntable to betilted relative to the horizontal. For instance if it is desired to tiltthe tip end of the cutter bar downwardly, this may be accomplished bydisconnecting the clutches from the front elevating screws 22 while therear elevating screw is connected to the motor l2, thereby causing therear edge of the turntable to be elevated. Conversely, if it is desiredto tilt the tip end of the cutter bar upwardly, the rear elevating screwmay be disconnected from the motor while the front elevating screws arerotated, thereby causing the forward edge of the turntable to be tiltedupwardly.

A shear or vertical cut may be inserted in the coal face simply byapplying one or the other of the reverse frictions ll, 'l2 of the headrotating mechanism, thereby rotating the head frame 6| about the neckaxis to bring the cutter bar S5 into a position to swing vertically.When the cutter bar assumes the full line position indicated at G inFig. 22 with the tip end of the cutter bar adjacent the mine roof, theapparatus is propelled bodily along the trackway, sumping the cutter barwithin the coal until it assumes the dotted line position indicated at Hin that figure. The cutter bar swinging mechanism is then connected, andthe cutter bar is swung downwardly in its plane from the positionindicated at H in Fig. 22 to the dotted line position indicated at I inthat figure. lThe apparatus is then propelled rearwardly along thetrackway to move the cutter bar from the position I to the positionindicated in dotted lines at J in Fig. 22, withdrawing the cutter barfrom the coal face. The cutter bar is sumped in, swung downwardly in itsplane and thereafter withdrawn from the coal face in the manner similarto that described above in connection with horizontal cutting inaccordance with the arcwall method. It will be noted that by rotatingthe head frame about the neck axis the cutter bar may be moved throughan arc of a circle into shearing positions at either side of the neckaxis, and when the cutter bar is thus disposed the adjustable supportingstructure may be swung horizontally about the axis of the hinge shaft 81to move the cutter bar from a center cutting position indicated at K inFig. 2() laterally to the position indicated at L in Fig. 19, theturntable 2 remaining stationary at that time.` "It" it is' desiredV toincreaseV "thel bY adjustment 4of the cutter support 92, the cutter barmay be positioned adjacent the rib asindicated atMin Fig. i8,theasupporting arm 8B being disposed in alinement with the arm structureof the turntable at that time. It will thus EL be seen Athat the cutterbar `may be disposed in any desired shearing position between the ribsofthe 'entry including a position at the center of the entry and positionsat either rib of the entry.V

To efr'ect a vertical or shearing cut in the mine wall when theapparatus is supported and guided by a curved trackway, the apparatus isoperated in the following vmanner: With the cutter bar 95 in shearingposition thev turntable 2 is rotated 26,2? to move the 'cuttingmechanism laterally until `the tip end oi thev cutter bar engages therib ofV the entry. The turntable is then locked against rotation thecutter bar is swung upwardly to a position adjacent the mine roof. Whenthe parts are thus disposed the apparatus is propelled along the curvedtrackway at a low speed to cause the tip end of the cutter bar topenctrate the coal. `The turntable clutch el is then released and theturntable is permitted to rotate freely relativoto the truck as theapparatus is propelled-bodily along the trackw'ay, and as a result, asthe apparatus moves along the curved traclrway the cutter bar is sumpedwithin the coal in the manner well known to those skilled l in the art,the free rotation. oi the turntable Vrelative to thetruck as the lattermoves along the trackway preventing binding oi the cutter bar vin thelzerf. `'Ihe cutter bar is then swung downwardly in its plane andwithdrawn from the coal to complete the shearing cut.

, As a result of .this invention, it will be noted that an improved coalmining apparatus is providedhaving improved adjustable kerl cuttingmechanism wherebyhorizontal keris may be cut @at or near theV level ofthe mine iioor outside and below the level of the mine trackway, andvertical kerfs may be out at `any desired location between the ribs ofthe entry. It will iurther be notedthat by the provision` of the imr.provedadjustable supporting .structure for the lrerfcutting mechanism,the cutter bar may be positioned `to cut keris in any desired horizontalplanes between the minetrooi and the mine 'floor or in.V any desiredvertical planes between t; the ribs ci. the entry. It will also beevident' that by the provision'of the improved adjustable supportingstructure and the tiltable turntable mounting forithe kerl` lcuttingmechanism the cutter bar `may. be universally [tilted to change itsangle "in altitude thereby to accommodate itself to a rolling orunevenbottom or pitchingV coal seam. It will still further be notedithatan improved coal mining apparatus is provided wherein the adjustingmechanism :for the keri 651e cutting mechanism is extremely exible, itbeing.

possible to operate-the apparatus as a mounted bottom cutter, topcutter, center cutter, shear, cutter and'slabbin'g'machine and tooperate the .y

apparatus to make shear cuts while the appadlratusis supported andguided by a' curvedtrackway,` thereby enabling the apparatus to `accornimodate itself to `practically every mining condition encountered within`theV normal workingran'ge oi actrack cutting machine. These andv75ii'other,uses and advantages oijthe ,improved mining apparatus willbe clearly apparent to those skilled in the art. Y

While there is in this application speciiically described one form whichthe invention may assume in practice, it will beunderstood that thisform oi the same is shown for purposes oi illustration and that theinvention may be ,modiiiedV and embodied in various other forms withoutdeparting from vits spirit or the scope of the appended claims. i Y

What I claim as `newand desire to secure by Letters Patent is: p Y

Lin a mining apparatus, a portable base, a supportingstructure-swingable horizontally rele ative to said portable base, asupport mounted on said supporting structure to rotate relative theretoabout a horizontal axis, an arm structure pivotally moun'ed on saidsupport to swing relative thereto, a kerf cutter support swingablyAmounted on the outer extremity of said arm structure, said cuttersupport being swingable rela-,- tive to said arm structure to move thekerl cutter into angularly related cutting planes, and motor operated,operator controlled means for swinging said cutter support relative tosaid arm` structure whilethe latter remains stationary as regardsswinging movement relative to said first, support.

2. In a mining apparatus, a portable b ase, a supporting structureswingable horizontally relative to said portable base, a supportmounted.V on said supporting structure to rotate relative thereto abouta horizontal axis, an arm structure` pivotally mounted on said supportto swing relative thereto, a kerf cutter support swingaoly mounted onthe outer extremity of `said arm' structure, said cutter support beingswingable relative to said arm structure` to move the korf cutter intoangularly related VVcutting planes, and motor operated, operatorcontrolled means ior independently swinging said arm structure relativeto said support and said cutter support rel-` ative to said armstructure.

3. In a mining apparatus, a portable base, a supporting structureswivelly mounted on said base `to swing horizontally relative theretoabout a vertical axis, a support mounted on said supporting structure toswing horizontally relative thereto about a parallel axis, a korf cuttersup-v port swivelly mounted on the outerextremity oi said support Atoswing-relative thereto about an axis parallel with' said axes, a kericcutter pivotally mounted on said cutter support-to swing in a verticalplane relative thereto about a horizontal axis, and motor operated,operator con. trolled means for swinging said cutter support relative tosaid first support while the latter remains stationary as regardsswinging movement relative to said Supporting structure.V

4C. In a mining apparatus, a portable base, a supporting structureswivelly mounted on said base to swing horizontally relativetheretoabout a vertical axis, a support mounted on said supporting structuretokswing horizontally relative thereto about a parallel axis, a kerfcutter support swivelly mounted on the outer extremity of said supportto swing relative thereto about an axis parallel with said axes, akeri'cutter pivotally mounted on said cutter support to swing in aVertical plane relative thereto about a horizontal axis, andmotoroperated, operator controlled means for independently swingingisaid rstsupport relative to said supporting structure and said cutter supportrelative to said rst support.. f

supporting structure swivelly mounted on said base to swing horizontallyrelative thereto about a vertical axis, a support mounted on saidsupporting structure to swing horizontally relative thereto about aparallel axis, a kerf cutter support swivelly mounted on the outerextremityoi said support to swing relative thereto about an axisparallel with said axes, a korf cutter pivotally mounted on said cuttersupport to swing in a vertical plane relative thereto about a horizontalaxis, and motor operated, operator controlled means for independentlyswinging said rst support relative to said supporting structure and saidcutter support relative to said first support, said iirst support beingswingable relative to said base about the axis of said supportingstructure or relative to said supporting structure about said parallelaxis.

6. In a mining apparatus, a portable base, a supporting structureswivelly mounted on said base to swing horizontally relative theretoabout a vertical axis, a support mounted on said supporting structure toswing horizontally relative thereto about a parallel axis, a lierfcutter support swivelly mounted on the cuter extremity of said supportto swing relative thereto about an axis parallel with said axes, a keifcutter pivotally mounted on said cutter support to swing in a verticalpla-ne relative thereto about a horizontal axis, and motor operated,operator controlled means for independently swinging said first supportrelative to said supporting structure and said cutter support relativeto said first support, said iirst support being swingable relative tosaid base about the axis of said supporting structure or relative tosaid supporting structure about said parallel axis and said cuttersupport being swingable relative to said rst support while said lattersupport remains stationary.

7. In a mining apparatus, a portable base, a supporting structureswivelly mounted on said base to swing horizontally relative theretoabout a vertical axis, a support mounted on said supporting structure toswing horizontally relative thereto about a parallel axis, a kerf cuttersupport swivelly mounted on the outer extremity of said support to swingrelative thereto about an axis parallel with said axes, a kerf cutterpivotally mounted on said cutter support to swing in a vertical planerelative thereto about a horizontal axis, said cutter support beingswingable relative to said first support while the latter remainsstationary, and motor operated, operator controlled means for swingingsaid cutter support relative to said first support and for swinging saidkerf cutter in its piane.

8. In a mining apparatus, a portable base, a supporting structureswivelly mounted on said base to swing horizontally relative theretoabout a vertical axis, a support mounted on said supporting structure toswing horizontally relative thereto about a parallel axis, a kerf cuttersupport swivelly mounted on the outer extremity of said support to swingrelative theretol about an axis parallel with said axes, a korf cutterhaving motor operated .swinging means and pivotally mounted on saidcutter support to swing in a vertical plane relative thereto about ahorizontal axis, said first support being swingable relative to saidsupporting structure while the latter remains stationary as regardsswinging movement about its own axis relative to said base, and motoroperated. operator controlled means for swinging said first supportrelative to said supporting structure and for swinging said cuttersupport relative to said iirst support, said cutter support beingswingable relative to said first support while the latter remainsstationary as regards swinging movement about its own axis.

9. In a mining apparatus, a portable base, a supporting structuremounted on said base to swing horizontally relative thereto, a supportmounted on said supporting structure to rotate relative thereto about ahorizontal axis, a second support mounted on said rst support to swingrelative thereto about an axis at right angles to the axis of said rstsupport, a kerf cutter support pivotally mounted on the outer extremityof said second support to swing relative thereto about an axis parallelwith the axis of said second support, a kerf cutter pivotally mounted,on said third support, and motor operated, operator controlled Ymeansfor swinging said cutter support relative to said second support whilethe latter remains stationary as regards swinging movement about its ownaxis.

10. In a mining apparatus, a portable base a supporting structuremounted on said base yto swing horizontally relative thereto, a supportmounted on said supporting structure to rotate relative thereto about ahorizontal axis, a second support mounted on said iirst support to swingrelative thereto about an axis at right angles to the axis of said rstsupport, a kerf cutter support pivotally mounted on the outer extremityof said second support to swing relative thereto about an axis parallelwith the axis of said second support, a korf cutter pivotally mounted onsaid third support, and motor operated, operator controlled means forindependently swinging said second and third supports about theirrespective a es.

l1. In a mining apparatus, a portable base, a supporting structuremounted on said base to swingV horizontally relative thereto, a supportmounted on said supporting structure to rotate relative thereto about ahorizontal axis, a second support mounted on said i'irst support toswing relative thereto about an axis at right angles to the axis of saidirst support, a kerf cutter support pivotally mounted on the outerextremity of said second support to swing relative thereto about an axisparallel with the axis of said second support, a kerf cutter pivotallymounted on said third support, and motor operated, operator controlledmeans for independently swinging said second and third supportsr abouttheir respective axes, said third support being swingable relative tosaid second support while the latter remains stationary.

12. In a mining apparatus, a portable base, a supporting structuremounted on said base to swing horizontally relative thereto, a supportmounted' on said supporting structure to rotate relative thereto about ahorizontal axis, a second support mounted on said first support to swingrelative thereto about an axis at right angles to the axis of said firstsupport, a kerf cutter support pivotally mounted on the outer extremityof said second support to swing relative thereto about an axis parallelwith the axis of said second support, a korf cutter pivotally mounted onsaid third support, and motor operated, operator controlled means forindependently swinging said second and third supports about theirrespective axes, said second support being swingable relative to saidfirst support while the latter remains stationary.

lso

13. In a miningapparatus, aportablebase, a Supporting Structure mountedon said base to swing horizontally relative thereto, a support mountedon said supporting structurel to rotate relatively thereto about `ahorizontalaxis, a second support mounted on said rst support to swingrelatively thereto about an axis at right angles to the axis of saidfirst support, a kerf cutter support pivotally mounted on the outerextremity of said second support to swing relatively thereto about anaxis parallel with the axis of said second support,` a kerf cutterpivotally mounted 'on said third support, and motoroperated, operatorcontrolled means for independently swinging said second and thirdsupports about theirrespeetive axes, said third support being swingablerelative to said second support while the lattei` remains stationary andsaid second support being swingable relative to said first supportwhilethe latter remains stationary. i i

14. In a mining apparatus, a portable base; a horizontal `turntablemounted on said base `to swing relative thereto about a vertical` axis,a single arm pivotally mounted on said turntable to swing relativethereto about avparallel axis, a

keri `cutter support pivotally mounted on theouter extremity of said armto swing relative thereto about an axis parallel withwsaid axes, saidarm constituting. the sole swingable supporting connection between theturntable and cutter support, and a kerf cutter Ypivotally mounted onsaid cutter support to swing in a `verticalplane relative thereto abouta horizontal axis.

15. in a mining apparatus, a portable base, a horizontal turntablemounted on said base to swing relatively thereto about a vertical axis,a single arm pivotally mountedlon said turntable to swing relativelytlfieretolabout` aparallel axis, a keri cutter support pivotally mountedon` the` outer extremity of said arm'to swing relatively thereto aboutan axis parallel with said axes,

`said arm constituting the sole swingable supn porting connectionvbetween the turntable andA cutter support, and a kerf cutterv pivotallymount-v ed on said cutter supportto swing` in avert1cal planerelativelythereto about aihorizontal axis;

said cutter support being swingable about'its axis relative to said arm`while the latter remains stationary. i i Y 16. In a mining apparatus, aportable base, `ahorizontal turntable mounted on said base to swingrelatively thereto about a vertical `ax1sa` single arm pivotally mountedon said turntable toswing relatively thereto about a parallel axis, akerf cutter support pivotally mounted on. the outer extremity of saidarm to swingrelatwely thereto about an axis parallel with 'said axes,said arm constituting thefsole swingable -supporting connection betweenthe turntable and cutter support, and a kerf cutter pivotally mountedonsaid cutter support'to swing in a vertical plane relative thereto abouta horizontal axis, said arm being swingable about the turntable axisrelative to the base and said cutter'support being independentlyswingable relative to said arm during swinging of said arm about theturntable axis. i i

1'7. In a mining apparatus, a `portable base, a horizontal turntablemounted on said base -to swingV relatively thereto-about a verticalaxis, a cutter head mounted on said turntable to `rotate relativelythereto about a horizontal axis, asingle arm pivotally mounted on `saidcutter head to swing relatively'thereto about an axis at right an-` glesto the cutter head axis, `a lrerf cutterfsupu port 'pivotally mounted onthe outer extremity of" said arm to swing relatively thereto about anaxis parallel with said arm axis, said arm constituting the solesupporting connection between the cut ter head and cutter support, and ak'erf` cutter` pivotallymounted on said cutter support to swingrelatively thereto about an axis at right angles to a line parallel toVa line parallel to said cutterI support axis. f-

18. In amining apparatus, a portable base, a

horizontal `turntable mounted on said base toi swing relatively theretoabout a vertical axis, a cutter head mounted on said turntable torotateV relatively thereto about a horizontal axis, a single armpivotally mounted on said cutter head to swing `relative thereto aboutan axis at right angles to the cutter head axis, a keri` cutter supportpivotally mounted on the outer extremity of said arm to swing relativelythereto about an axis parallel with said arm axis, said arm,constituting the sole supporting connection `between the cutter head andcutter support, and a kerf cutter pivotally mounted on. said cuttersupport to swing relativelyVv theretoabout an axisat right angles toaline parallel to a line parallel. to said cutter support axis, `saidcutter support being swingable about itsaxis relative to said arm whilethe latter remains stationary. Y

19. In a miningapparatus, aportable base, a

horizontal turntable mounted on said ,base to portrpivotally mounted onthe` outer extremity oi said armto swing relatively thereto about anaxis parallel with said arm axis, said arm constituting thesolelsupporting conneetionrbetween the cut` ter head andcutter support,and a kertcutter pivotally mounted `on said cutter support to swingrelatively thereto about an axis at right `angles to a line parallel toa line parallel to said cutter support, axis, said cutter support beingswingable about its axis relative to said arm while the latter'remainsistationarm said arm being swingable about the turntable axisrelative to the base and said cutter support being independently.swing-A. ablerelative to said arm during swinging of said arm about theturntable axis. M *Y v 20. Inafmining apparatus, a portablebase; ahorizontal'turntable mounted on saidbase for rotation about a verticalaxis relativelytliereto, a cutter head mounted on said turntable torotate relativelyfthereto about an axis extendingradially with respect`to the axial lineof the turntable, an` arm pivotally mounted on saidcutter headto swing relativelythereto about an axis atright; angles. totheYV head axis, a kerf cutter, support pivotally mounted on theouterextremity ofsaid arm to `swing relatively thereto about an axispara allel tothe arm axisand a kerf cutter pivotally mounted on saidcutter support to swing relatively thereto about an axis at right anglesto a 'line parallel to a line parallel to the axis of said cuttersupport, saidl turntable being rotatable, and Y ture for said kerfcutter adjustable to position the same in a plurality of parallel planeswithin certain limits and in other parallel planes outside said limits,said supporting structure including supporting elements adjustablerelative to the base about parallel axes spaced longitudinally of saidbase, said kerf cutter adjustable upon adjustment about the front axisinto parallel cutting positions to cut parallel kerfs within certainlimits and adjustable upon adjustment about the rear axis into parallelcutting positions parallel with aforesaid cutting positions to cutparallel kerfs outside of said limits.

22. In a mining apparatus, a portable base, a kerf cutter, and anadjustable supporting structure for said kerf cutter adjustable toposition the same in a plurality of parallel planes within certainlimits and in other parallel planes outside said limits, said supportingstructure including supporting elements adjustable relative to the baseabout parallel axes spaced longitudinally of said base, said kerf cutteradjustable upon adjustment about the front axis into parallel cuttingpositions to cut parallel kerfs within certain limits and adjustableupon adjustment about the rear axis into parallel cutting positionsparallel with aforesaid cutting positions to cut parallel keris outsideof said limits, said supporting structure also including means forsupporting the kerf cutter for adjustment about a longitudinal axis intohorizontal and vertical cutting positions.

23. In a mining apparatus, a portable base, a kerf cutter, and anadjustable supporting structure for said kerf cutter adjustable toposition the same in a plurality of parallel planes within certainlimits and in other parallel planes outside said limits, said supportingstructure including supporting elements adjustable relative to the baseabout parallel axes spaced longitudinally of said base, said kerf cutteradjustable upon adjustment about the front axis into parallel cuttingpositions to cut parallel kerfs within certain limits and adjustableupon adjustment about the rear axis into parallel cutting positionsparallel with aforesaid cutting positions to cut parallel kerfs outsideof said limits, said supporting structure also including means forsupporting the kerf cutter for adjustment about a longitudinal axisextending radially from said rear axis to move the kerf cutter intohorizontal and vertical cutting positions.

24. In a mining apparatus, a portable base, a kerf cutter, and anadjustable supporting structure for said kerf cutter adjustable toposition the same in a plurality of parallel planes within certainlimits and in other parallel planes outside said limits, said supportingstructure including supporting elements adjustable relative to the baseabout parallel'axes spaced longitudinally of said base, said kerf cutteradjustable upon adjustment about the front axis into parallel cuttingpositions to cut parallel kerfs within certain limits and adjustableupon adjustment about the rear axis into parallel cutting positionsparallel with aforesaid cutting positions to cut parallel kerfs outsideof said limits, said supporting structure also including means foradjusting the kerf cutter into a position to cut a horizontal kerf atthe level of the mine bottom.

25. In a mining apparatus, a portable base, a kerf cutter, and anadjustable supporting structure for said kerf cutter adjustable toposition the same in a plurality of parallel planes within certainlimits and in other parallel planes outside said limits, said supportingstructure including supporting elements adjustable relative to the baseabout parallel axes spaced longitudinally of said base, said kerf cutteradjustable upon adjustment about the front axis into parallel cuttingpositions to cut parallel kers within certain limits and adjustable uponadjustment about the rear axis into parallel cutting positions parallelwith aforesaid cutting positions to cut parallel kerfs outside of saidlimits, said supporting structure also including means for adjusting thekerf cutter into a position to cut a horizontal kerf at the level of themine bottom outside the path of movement of the base and in advance ofsaid base.

26. In a mining apparatus, a portable base, a kerf cutter, and anadjustable supporting structure for said kerf cutter includingsupporting elements swingable horizontally relative to the base aboutparallel axes spaced longitudinally of the base and for adjusting thekerf cutter into 1 horizontal and shearing positions about an axisextending radially from the rear axis of horizontal swinging movement,said kerf cutter adjustable upon adjustment about the forward axis ofhorizontal swinging movement into positions i porting elementsadjustable about parallel axes spaced longitudinally of said base, saidkerf cutter adjustable upon adjustment about the front axis intoparallel shear cutting positions within certain limits and adjustableupon adjustment about the rear axis into parallel shear cuttingpositions parallel to said rst mentioned positions and outside or saidlimits and at either side of the base whereby the shearing range of thekerf cutter is extended.

28. In a mining apparatus, a portable base, a

kerf cutter, and an adjustable supporting structure for said kerfcutter, said supporting structure including supporting elementsadjustable relative to the base about parallel axes spacedlongitudinally of the base, said kerf cutter adjustable upon adjustmentabout the front axis into parallel cutting positions to cut parallelkerfs within certain limits within the sides of said base and beyond thesides of said base, said kerf cutter adjustable upon adjustment aboutthe rear axis into parallel cutting positions parallel with aforesaidcutting positions to cut parallel kerfs outside of said limits andbeyond the outermost range of aforesaid adjustment about said frontaxis.

29. In a mining apparatus, a portable base, a shearing kerf cutter, andan adjustable supporting structure for said kerf cutter including asupporting element adjustable about parallel axes spaced longitudinallyof said base, said kerf cutter adjustable upon adjustment about thefront axis into parallel shear cutting positions within certain limitsbetween the sides of said base and beyond the sides of said base, saidkerf cutter adjustable upon adjustment about the rear axis into parallelshear cutting positions parallel to said first mentioned positions andoutside of said limits beyond the outermost limits of adjustment aboutsaid front axis whereby the shearing range of the kerf cutter isextended.

" '30. `In a mining apparatus, alportablebasega ture includingsupporting elements adjustable relative to the base about parallelvertical` axes spaced longitudinally` of the base, said kerf cutteradjustable upon adjustment about the front axis into` parallel cuttingpositions to cut Vparallel kerfs within certain limits within the sidesof said. base and beyond the sides of said base, said `kerf cutteradjustable upon adjustment about the rear axis into parallelcuttingxpositions `parallel with aforesaid cutting positions tocutparallel kerfs outside of said limits and lbeyond the outermost rangeof aforesaid adjustment about said'front axis. l Y i v l 3l.` In `amining apparatus, a portable base,'a shearing kerf cutter, and anadjustable supporting structure for said kerf cutterincluding supportingelements adjustableabout parallel vertical axesspaced longitudinally ofsaid base, said kerf cutter adjustable upon adjustment about the frontaxis into parallelshear'cutting@positions Within certain limits betweenthe l"sides of `said base and beyond the' sidesofsaid base, said kerfcutter adjustable upon adjustment about the rear axis into parallelshear cuttingfpositions parallel to said iirst mentioned positionsA andoutside-ofV said limits beyond the outermost limits of adjustment aboutsaid front axis whereby the shearingrange of the kerf cutter isextended.` i 1" l 32. In a mining apparatus,` a portable basef'a kerfcutter, and an adjustable" supportingstructure for said kerf cutter,said-supporting structure .i including supporting Ielements adjustablerelative to the base about Vparallel vertical laxes spacedlongitudinally of the base, the rearrnost of `said axes lying in thelongitudinali-vertical center of the machine, said kerf cutteradjustable upon vadjustment about the front axis into parallel cuttingpositions Vto fout pa'rallel-kerfs: within certainlimits within thesides of said base and beyond the sides vof saidbasefsaid kerf cutteradjustable upon-adjustment about the `rear axis in parallel cuttingpositions parallel with aforesaid cutting positions to cut parallelkerfs outside of said limits and beyond the outermost rrange ofaforesaid adjustment about said iront axis. f

33. In a mining apparatus, a portable base, a shearing kerf cutter, andan adjustable supporting structure for said ker-frcutterincludingsupporting elements adjustable aboutparallel `vertical axesspaced longitudinally of saidlbasathe rearmost ofwsaid axes lying in thelongitudinal vertical center of the machina'said kerf cutter adjustableupon adjustment aboutthe front axis into parallel shear cuttingpositionslwithin certainv limits between the sides of saidbase andbeyond the sides of said base, said kerfcutter adjustable uponadjustment about'the rear axis into `parallel shear .cutting positionsparallel'to said first mentioned positions and outside of said limvitsbeyond the outermost limits of adjustment `about said front axis wherebythe shearing range of thekerf cutter is extended.

34.. In a mining apparatus, a portable base, a horizontal turntable' onsaidV base, a support mounted on said base for rotation relative theretoabout a horizontal axis extending radially `with respect to theturntable axis, an `arm pivotally mounted on said support to swingrelative thereto `about an axis at right angles tothesupport axis, asecond support pivotally mounted on the outer extremity of said arml toswing relative thereto about an axis parallel with-*the arm pivot axis,anda kerf cutter pivotally mounted on said second support to swingrelativeV thereto about an axis at right angles to a line parallel to aline parallel to the axis of said second support, said kerf cutterbeing'swingable with `said second support through a relatively widerangewhile the arm remains stationary as. regards,

swinging movement about `its own axis; i

35. `ln a mining apparatus, a portable base, a horizontal turntable onsaid base, a support mounted on said base for rotation relative theretoabout a horizontal axis extending radially with respect to. the`turntable axis, an arm pivotally mounted on said support to swingrelative thereto about an axis at right angles to the support axis, asecond support pivotally mounted on the outer` extremity of Vsaid arm toswing relative thereto about an axis parallel with the arm y pivot axis,a kerf cutter pivotally mounted on said second support to swing relativethereto about an axis at right angles to a line parallel to alineparallel to the `axis of said second support, and a motoivon saidturntable for rotating saidrst support, for swinging said 'arm relativeto said rst support, for swinging said second support f relative to saidarm while the latter is stationary and for swinging said kerf cutterabout its pivot; ,36. In a mining apparatus, a portable base, ahorizontal turntable on said base, a `support mounted on said base forrotation relative there-- to'about a horizontal axis extending radiallywith respect to the turntable axis, an arm pivotally mountedon saidsupport to swing relative thereto about an axis at right angles to thesupport'axis, a second support pivotally mounted on the outer extremityof said arm 'to swing relative thereto about anaxs parallel with the armpivotl axis, a kerf cutter pivotally mounted on said second support toswing relative thereto about an axis at right angles to a line parallelto a line parallel to the `axis of said second support, and a motor onsaid, turntable `for rotating said turntable relative to the base, forrotating saidrst support relative to the turntable, for swingingsaid'army relative to said first support, for swinging said secondsupport relative' to said arm while the latter is stationary and forswinging said kerf cutter aboutfits pivot relative to said secondsupport.

, a l.37.In a mining apparatus, a portable basava horizontal turntableon said base, mechanism for adjusting said turntable into diierentelevatedr positions, relative to thebase, aisupport mounted on saidturntable for `rotation relative thereto about an axis extendingradially with respect to the turntable axis, an arm pivotally mounted onsaid support to swing relative thereto aboutan'axisat right angles tosaid support axis, a

secondY support pivotally mounted on 4the outer' extremity Vof said armto swing relative theretoV independently thereof about an axis parallelwith'the arm pivot axis, and a kerf cutter pivotally mounted on saidsecond support to swing relativeY thereto about an axis at right anglesto a line parallel to a line parallel to the axis of said secondsupport,

, 38,'In a mining apparatus, a Vportable base,

the outer extremity of said arm to swing rela?, tive thereto about anaxis parallel with the arm pivot axis, a kerf cutter pivotally mountedon said second support to swing relative thereto about an axis at rightangles to a line parallel to a line parallel to the axis of said secondsupport, and a motor on said turntable for rotating said rst support,for swinging said arm relative to said rst support, for swinging saidsecond support relative to said arm independently of swing of the latterandfor swinging said kerf cutter about its pivot.

39. In a mining apparatus, a portable base, a horizontal turntable onsaid base, mechanism for adjusting said turntable into differentelevated positions relative to the base, a support mounted on saidturntable for rotation relative thereto about an axis extending radiallywith respect to the turntable axis-an arm pivotally mounted on saidsupport to swing relative thereto about an axis at right angles to saidsupport axis, a second support pivotally mounted on the outer extremityof said arm to swing relative thereto about an axis parallel with thearm pivot axis, a kerf cutter pivotally mounted on said second supportto swing relative thereto about an axis at right angles to a lineparallel to a line parallel to the axis of said second support, and amotor on said turntable for rotating said turntable relative to thebase, for rotating said rst support relative to the turntable, forswinging said arm relative to said iirst support, for swinging saidsecond support relative to said arm independently of swing of the latterand for swinging said kerl cutter about its pivot relative to saidsecond support.

40. In a mining apparatus, a portable base, a horizontal turntable onsaid base, mechanism for adjusting said turntable into differentelevated positions relative to the base and for tilting the turntableabout a transverse axis relative to the horizontal, a support mounted onsaid turntable for rotation relative thereto about an axis extendingradially with respect to the turntable axis, an arm pivotally mounted onsaid support to swing relative thereto about an axis at right angles tosaid support axis, a second support pivotally mounted onrthe outerextremity of said arm to swing relative thereto independently thereofabout an axis parallel with the arm pivot axis, and a kerf cutterpivotally mounted on said second support to swing relative thereto aboutan axis atright angles to a line parallel to a line parallel to the axisof said second support.

41. In a mining apparatus, a portable base, a horizontal turntable onsaid base, mechanism for adjusting said turntable into differentelevated positions relative to the base and for tilting the turntableabout a transverse axis relative to the horizontal, a support mounted onsaid turntable for rotation relative thereto about an axis extendingradially with respect to the turntable axis, an arm pivotally mounted onsaid support to swing relative thereto about an axis at right angles tosaid support axis, a second support pivotally mounted on the outerextremity of said arm to swing relative thereto about an axis parallelwith the arm pivot axis, a kerf cutter pivotally mounted on said secondsupport to swing relative thereto about an axis at right angles to aline parallel to a line parallel to the axis of said second support, anda motor on said turntable for rotating said rst support, for swingingsaid arm relative to said first support,

for swinging said second support relative to said arm independently ofswing of the latter and for swinging said kerf cutter about its pivot,

42. In a mining apparatus, a portable base, a horizontal turntable onsaid base, mechanism for adjusting said turntable into differentelevated positions relative to the base and for tilting the turntableabout a. transverse axis relative to the horizontal, a support mountedon said turntable for rotation relative thereto about an axis extendingradially with respect to the turntable axis, an arm pivotally mounted onsaid support to swing relative thereto about an axis at right angles tosaid support axis, a second support pivotally mounted on the outer.extremity of said arm to swing relative thereto about an axis parallelwith the arm pivot axis, a kerf cutter pivotally mounted on said secondsupport to swing relative thereto about an axis at right angles to aline parallel to a line parallel to the axis of said second support, anda motor on said turntable for rotating saidturntable relative to thebase, for rotating said rst support relative to the turntable, forswinging said second support relative to said arm independently of swingof the latter and for swinging said Vkerf cutter about its pivotrelative to said second support.

43, In a mining apparatus, a portable base, a horizontal turntable onsaid base, mechanism for adjusting said turntable into differentelevated positions relative to the base and for universally tilting theturntable relative to the horizontal, a support mounted on saidturntable for rotation relative thereto about an axis extending radiallywith respect to the turntable axis, an arm pivotally mounted on saidsupport to swing' relative thereto about an axis at right angles to saidsupport axis, a second support pivotally mounted on the outer extremityof said arm to swing in dependently relative thereto about an axisparallel with the arm pivot axis, and a kerf ,cutter pivotally mountedon said second support to swing relative thereto about an axis at rightangles to a line parallel to a line parallel to the axis of said secondsupport.

44. In a mining apparatus, a portable base, a horizontal turntable onsaid base, mechanism for adjusting said turntable into differentelevated positions relative to the base and for universally tilting theturntable relative to the horizontal, a ,f

support mounted on said turntable for rotation relative thereto about anaxis extending radially with respect to the turntable axis, an armpivotally mounted on said support to swing relative thereto about anaxis at right angles to said support axis, a second support pivotallymounted on the outer extremity of said arm to swing relative theretoabout an axis parallel with the arm pivot axis, a kerf cutter pivotallymounted on said second support to swing relative thereto about an axisat right angles to a line parallel to a line parallel to the axis ofsaid second support, and a motoron said turntable for rotating said rstsupport, for swinging said arm relative to said first support, forswinging said second support independently relative to said arm and forswinging said kerf cutter about its pivot.

45,. In a mining apparatus, a portable base, a horizontal turntable onsaid base, mechanism for adjusting said turntable into dirlerentelevated positions relative to the base and for universally tilting theturntable relative t0 the horizontal, a support mounted on saidturntable for rotation relative thereto about an axis extending radiallywith respect to the turntable aXS, an arm DiV- otally mounted on saidsupport to swing relative thereto about an axis at right angles to saidsupport axis, a second support pivotally mounted on the outer extremityof said arm to swing relative thereto about an axis parallel with thearm pivot a kerf cutter pivotally mounted on said second support toswing -relative thereto about an axis .at right angles to a lineparallel to a line parallel to the axis `of said second support, and amotor on said turntable for rotating said turntable relative to thebase, for rotating said iirst support relative to the turntable, forswinging said second support relative to said arm independently of swingof the latter and for swinging said kerf cutter about its pivot relativeto said second support.

46. In a mining apparatus, a portable base, a shearing kerf cutter,andan adjustable supporting structure for said kerf cutter includingsupporting elements adjustable about parallel axes spaced longitudinallyof the base, said lcerf cutter adjustable upon adjustment about thefront axis into parallel shear cutting positions between the sides ofthe base and beyond the sides of the base, said kerf cutter adjustableupon adjustment about the rear axis into parallel shear cuttingpositions parallel to said first mentioned positions and outside of saidlimits, said kerf cutter adjustable to cut parallel shearing kerfs ateither rib of an entry of a width equal to more than twice the width ofthe apparatus.

47. In a mining apparatus, a portable base', a frame overlying said baseand swingable horizontally relative thereto about a vertical axis, saidframe overhanging the forward end` of said base, a support pivotallymounted on the outer overhanging extremity of said frame to swinghorizontally relative thereto about an axis parallel with the frameaxis, a cutter support pivotally mounted on the outer extremity of saidrst support to swing relative thereto about an axis parallel with thesupport axis, a kerf cutter pivotally mounted on said second support toswing relative theretoabout an axis at right angles to a 1in@ parallelto a une parauei to the axis of said second support, and motor operateddevices kfor swinging said frame relative to the base, for swinging saidfirst support relative to said frame, for swinging said second supportrelative to said rst support and for swinging said kerf cutter relativeto said second support, said first support being swingable relative` tosaid frame while the latter remains stationary and said second supportbeing swingable relative to said iirst supportwhile said first supportremains stationary.

48. In a mining apparatus, a portable base, a frame overlying said baseand swingable hori- Zontally relative thereto about a vertical axis,said frame overhanging the forward end of said base, a support pivotallymounted o n the outer overhanging extremity of said frame to swinghorizontally relative thereto about an axis parallel with the frameaxis, a` cutter support pivotally mounted on the outer extremity of saidrst support to swing relative thereto about an axis parallel with thesupport axis, a kerf cutter pivotally mounted on said second support toswing relative thereto about an axis at right angles to a lineparallel-to a line parallel to the axis of said second support, andmotor operated devices for swinging said frame relative to the base, forswinging said Iirst support relative to said frame, for swinging saidsecond support relative to said first support and for swinging said kerfcutter relative to said second support, said first support beingswingable relative to said frame while the latter remains stationary andsaid second. support being swingable relative to said iirst supportwhile said first supportremains stationary, said motor operated devicesincluding a motor mounted on 'said swingable frame.

49. In amining apparatus, aportable base, a frame structure mounted onsaid base 'to swing liorizontallyrelative thereto, a support mounted onsaid iramestructure for rotation relative thereto about a horizontalaxis, an arm structure pivotally mounted on said rotatable support toswing relative thereto, a cutter support pivotally mounted on said armstructure, a kerf cutter pivotally mounted onV said cutter support, anda 4motor relative to which said arm structure is swingable forswingingsaid arm structure, for swinging said cutter support relative tosaid arm structure and for swinging said kerf cutter, said cuttersupport being swingable relative to said arm structure-while the latterremains stationary as regardsv swinging movement about its own axls.y ni 50..In a mining apparatus, a portable base, a frame structure mountedon said base to swing horizontally relative thereto, a support mountedon said Yframe structure for rotation relative thereto aboutafhorizontal axis,V an arm struc- 4ture'pivotally, mounted on saidrotatable support to swing `relative thereto, a cutter supportpivotallymounted on said arm structure, a lier-f cutter pivotallymounted on said cutter support, and a motor mounted on said swingableframe structure and relative to which said arm structure is swingablefor swinging said arm structure, for swinging said cuttersupportrelative to said arm structure while-the latteris stationary andfor swinging said kerf cutter; 1 i

5l.` In a mining apparatus, a portable base. a frame structure mountedon said base to swing horizontally. relative thereto, a support mountedon saidV frame structure for rotation relative thereto about. ahorizontal axis, an arm structure pivotally mounted on said rotatablesupport to swing relativethereto, a cutter support pivotally mounted on`said arm structure, a kerf cutter pivotally `mounted on saidcutterfsupport, and a Inotor relative to which `said arm structure isswingable for swinging said frame structure relative. to said base, forswinging said cutter support relative to said arm structure` and forswinging saidkerf cutter, said cutter support being swingable relativeto` said arm structure while the latter remains `stationary as regardsswinging movement about its own axis.

52. In a mining apparatus, a portable base, a `frame structure mountedon said base to swing horizontally relative thereto, a support mountedon said frame structure for rotation relative thereto about a horizontalaxis, an arm structure pivotally mounted `on said rotatable support toswing relative thereto, acutter support pivotally mounted Von said armstructure, a kerf cutter pivotally mounted on said cutter support, and amotor mounted on said swingable frame structure and relative to whichsaid `arm ,structure is swingable for swinging said frame structurerelative to'said base, for swinging said cutter support relative to saidarm structure independently of movement of the latter and for swingingsaid kerf cutter.

53. In aV mining apparatus, a portable base, a frame structure mountedon said base and extending forwardly in advance of said base, and a kerfcutter support pivotally mounted on the Cgi outer extremity of saidframe structure, said frame structure including articulated supportingelements swingable simultaneously about a common axis to move the cuttersupport through a relatively wide range of adjustment and one supportingelement swingable relative to the other about a different axis to movethe cutter support through a relatively restricted range of adjustment,and devices for swinging said cutter support relative to said framestructure to maintain the kerf cutter in parallel cutting positionsduring either adjustment of said framestructure.

54. In a mining apparatus, a portable base, a frame structure mounted onsaid base and extending forwardly in advance of said base, and a kerfcutter support pivotally mounted on the outer extremity of said framestructure, said frame structure including articulated supportingelements swingable simultaneously about a common axis to move the cuttersupport through a relatively wide range of adjustment and one supportingelement swingable relative to the other about a diierent axis to movethe cutter support through a relatively restricted range of adjustment,and devices for swinging said cutter support relative to said framestructure to maintain the kerf cutter in parallel cutting positionsduring either adjustment of said frame structure, one of said supportingelements pivotally connected to the other about a horizontal axiswhereby one supporting element may be swung relative to the other tomove the cutter support into horizontal and vertical cutting positions.

55, In a mining apparatus, a portable base, a horizontal turntable onsaid base, a kerf cutter, and an adjustable supporting structureadjustable about a radial horizontal axis relative to said turntable andintervening said turntable and kerf cutter, said supporting structureincluding but a single arm hinged to said turntable at the forward endof said base to swing about an axis at right angles to a line extendingradially from the turntable axis and on which the kerf cutter ispivotally mounted, said arm constituting the sole supporting connectionbetween the kerf cutter and said turntable, and mechanism for adjustingsaid supporting structure to position said kerf cutter into parallelplanes, said adjusting mechanism including means for swinging said armabout its pivot to move said kerf cutter into aforesaid parallel planes.

56. In a mining apparatus, a portable base, a horizontal turntable onsaid base, a kerf cutter, and an adjustable supporting structureadjustable about a radial horizontal axis relative to said turntable andintervening said turntable and kerf cutter, said supporting structureincluding but a single arm hinged to said turntable at the forward endof said base to swing about an axis at right angles to a line extendingradially from the turntable axis and on which the kerf cutter ispivotally mounted, said arm constituting the sole supporting connectionbetween the kerf cutter and said turntable, and mechanism for adjustingsaid supporting structure to position said kerf cutter into parallelplanes adjacent the mine door and parallel planes a substantial distanceabove the top of said turntable, said adjusting mechanism includingmeans for swinging said arm about its pivot to move said kerf cutterinto aforesaid parallel planes.

57. In a mining apparatus, a portable base, a horizontal turntable onsaid base, an arm pivotally mounted on said turntable to swing in avertical direction relative thereto about an axis transverse to a lineextending radially from the turntable axis, a cutter support pivotallymounted on the outer extremity of said arm to swing relative theretoabout an axis parallel with the arm pivot axis, a horizontal kerf cuttermounted on said cutter support, said cutter sup port swingable about itspivot relative to said arm to move said keri cutter into relativelyinclined cutting planes, means for swinging said arm relative to saidturntable and said cutter support relative to said arm to move said kerfcutter into parallel horizontal planes including horizontal planes aboveand below said turntable while the lierf cutter at all times remain in ahorizontal cutting position, and means for adjusting said arm relativeto said turntable to move said kerf cutter in a vertical cuttingposition,

58. In a mining apparatus, a portable base, a horizontal turntable onsaid base, an arm pivotally mounted on said turntable to swing in avertical direction relative thereto about an axis transverse to a lineextending radially from the turntable axis, a cutter support pivotallymounted on the outer extremity of said arm to swing rela tive theretoabout an axis parallel with the arm .pivot axis, a horizontal lierfcutter mounted on said cutter support, said cutter support swingableabout its pivot relative to said arm to move said kerf cutter intorelatively inclined cutting planes, means for swinging said arm relativeto said turntable and cutter support relative to said arm to move saidkerf cutter into parallel horizontal planes including horizontal planesadjacent the mine floor and horizontal planes a substantial distanceabove the top of said turntable while the kerf cutter at all timesremains in a horizontal cutting position, and means for ad justing saidarm relative to said turntable to move said kerf cutter into a verticalcutting position.

59. In a mining apparatus, a portable base, a horizontal turntable onsaid base, an arm pivotally mounted on said base to swing in a verticaldirection relative thereto about an axis transverse to a line extendingradially from the turntable axis, said arm extending longitudinally ofthe base a substantial distance in advance of the base, a cutter supportpivotally mounted on the outer extremity of said arm to swing relativethereto about an axis parallel with the arm pivot axis, said cuttersupport being swingable through at least 96 relative to said arm, a kerfcutter mounted on said cutter support, said cutter support swingableabout its pivot relative to said arm to move said kerl cutter intorelatively inclined cutting planes, means for swinging said arm andsupport about their respective axes, and means for adjusting said armrelative to said turntable to move said kerf cutter into a verticalcutting position.

60. In a mining apparatus, a portable base, a horizontal turntable onsaid base, an arm pivotally mounted on said base to swing in a verticaldirection relative thereto about an axis transverse to a line extendingradially from the turntable axis, said arm extending longitudinally ofthe base a substantial distance in advance of the base, a cutter supportpivotally mounted on the outer extremity of said arm to swing relativethereto about an axis parallel with the arm pivot axis, said cuttersupport being swingable through substantially 180 relative to said arm,a kerf cutter mounted on said cutter support, said cutter supportswingable about its pivot

